Optical Activation of Plasmonic Germanium Nanoantennas Resonant in the Mid-Infrared

Marco P. Fischer; Christian Schmidt; Johannes Stock; Emilie Sakat; Antonio Samarelli; Jacopo Frigerio; Paolo Biagioni; Douglas J. Paul; Giovanni Isella; Alfred Leitenstorfer; Daniele Brida

2015 European Conference on Lasers and Electro-Optics - European Quantum Electronics Conference
(Optica Publishing Group, 2015),
paper EH_5_5

Optical Activation of Plasmonic Germanium Nanoantennas Resonant in the Mid-Infrared

Marco P. Fischer, Christian Schmidt, Johannes Stock, Emilie Sakat, Antonio Samarelli, Jacopo Frigerio, Paolo Biagioni, Douglas J. Paul, Giovanni Isella, Alfred Leitenstorfer, and Daniele Brida

European Quantum Electronics Conference 2015

Munich Germany
21–25 June 2015
ISBN: 978-1-4673-7475-0

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Emission Control with Nanoantennas (EH_5)

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M. P. Fischer, C. Schmidt, J. Stock, E. Sakat, A. Samarelli, J. Frigerio, P. Biagioni, D. J. Paul, G. Isella, A. Leitenstorfer, and D. Brida, "Optical Activation of Plasmonic Germanium Nanoantennas Resonant in the Mid-Infrared," in 2015 European Conference on Lasers and Electro-Optics - European Quantum Electronics Conference, (Optica Publishing Group, 2015), paper EH_5_5.

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Abstract

Plasmonics provides an elegant way to effectively couple optical radiation to single sub-wavelength quantum systems [1]. In particular, the mid-infrared vibrational fingerprint region is of particular interest for sensing large molecules of biological relevance. In this context, we introduce germanium as a novel material for active mid-IR plasmonics. Semiconductors offer the possibility to tune the plasma frequency by selection of the doping level. Moreover, the same effect can be achieved by ultrafast near-IR excitation of electron-hole pairs in intrinsic Ge [2]. This approach gives us full optical control over the plasmonic resonance in nanoantennas.

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